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MULTIPLYING AND DIVIDING INTEGERS AND DECIMALS BY 10, 100 AND 1000

MULTIPLYING AND DIVIDING INTEGERS AND DECIMALS BY 10, 100 AND 1000. LEARNING OBJECTIVES. TO KNOW THE EFFECT OF MULTIPLYING NUMBERS BY 10, 100 AND 1000 TO BE ABLE TO MULTIPLY AND DIVIDE NUMBERS BY 10, 100 AND 1000

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MULTIPLYING AND DIVIDING INTEGERS AND DECIMALS BY 10, 100 AND 1000

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  1. MULTIPLYING AND DIVIDING INTEGERS AND DECIMALS BY 10, 100 AND 1000

  2. LEARNING OBJECTIVES • TO KNOW THE EFFECT OF MULTIPLYING NUMBERS BY 10, 100 AND 1000 • TO BE ABLE TO MULTIPLY AND DIVIDE NUMBERS BY 10, 100 AND 1000 • TO USE UNDERSTANDING OF PLACE VALUE TO MULTIPLY AND DIVIDE WHOLE NUMBERS AND DECIMALS BY 10, 100 AND 1000

  3. DO NOW! CHOOSE THE CORRECT ANSWER FROM THE BOXES

  4. L.O. multiply and divide by 10/100 24 x 10 24 42 420 240

  5. L.O. multiply and divide by 10/100 37 x 10 3700 37 370 307

  6. L.O. multiply and divide by 10/100 187 x 10 1870 1780 180 18700

  7. L.O. multiply and divide by 10/100 24 x 100 240 420 4200 20

  8. L.O. multiply and divide by 10/100 60 ÷ 10 6 06 60 600

  9. L.O. multiply and divide by 10/100 3000 ÷ 10 300 30 30,000 3000

  10. L.O. multiply and divide by 10/100 740 ÷ 10 740 74 7,400 400

  11. STARTER 26 000, 26, 260 . WHICH NUMBER IS MISSING IN THE SEQUENCE?

  12. 2600 WHAT IS THE RELATIONSHIP BETWEEN THE NUMBERS?

  13. WHAT HAPPENS IF WE MULTIPLY 19 BY 10? 19 X 10 = 190 It looks as if we ‘add a zero’ because the numbers all move one place along the place value grid to the left.(the number is 10 times bigger) Numbers have digits that occupy particular places according to their value.

  14. Multiplying by 10

  15. Multiplying by 100 • What do you think is the multiplication question in the grid?

  16. 19 x 100 • When you multiply a number by 100, the number becomes 100 times bigger! • Multiplying by 100 is the same as multiplying by 10 and by 10 again

  17. Multiplying decimals by 10,100 and 1000 Sam has saved £3.46. His rich uncle says he will multiply his savings by 100! £3.46 x 100 =

  18. Have a go! 1.8 x 10= 3.9 x 10= 1.38 x 100= 27.9 x 100= 0.056 x 10=

  19. Di viding by 10 The length of Jo’s shelf is 126cm. He wants to put 10 boxes on this shelf. How much space will she have for each box? 126cm ÷ 10 =

  20. Dividing by 10 When dividing by 10, the digits move to the right one place. ( the number is 10 times smaller) 126cm ÷ 10 = 12.6cm Joe has 12.6cm for each of her boxes.

  21. What happened? Each digit has moved one place to the left. The opposite of what happened in multiplication, were each digit moved to the right.

  22. Dividing by 100

  23. Have a go! 18÷ 10 = 374 ÷ 10 = 257 ÷ 100 = 81352 ÷ 1000 = 1.34 ÷ 100 =

  24. Recap • MULTIPLYING X 10 DIGITS MOVE LEFT 1 SPACE X 100 DIGITS MOVE LEFT 2 SPACES X 1000 DIGITS MOVE LEFT 3 SPACES • DIVIDING ÷10 DIGITS MOVE LEFT 1 SPACE ÷100 DIGITS MOVE LEFT 2 SPACES ÷1000 DIGITS MOVE LEFT 3 SPACES

  25. Work out using the place value grid 286 x 10 = 36.24 x 10 = 1.572 x 100= 6345 ÷ 1000= 5.39 ÷ 10 =

  26. Complete by writing the missing number. _______x 10 = 1820 ________x 100= 12 000 16.8 x _____= 16 800 0.834 x ____ = 83.4 ______ ÷ 10 = 7000 ______ ÷ 100 = 804 530 ÷ _____= 0.53 3541.3 ÷ _____ = 354.13

  27. Extension How many centimeters make: 380m? 2000m? How many meters make: 72km? 4500km?

  28. I hope you enjoyed today’s lesson! Did you achieve the objectives for the day? I would be expecting your answers to slide 25, 26 and 27 in my box (oloralolade@yahoo.com)

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